1. A
   Cylindrical, unbranched
2. B
   Spindle - shaped, uninucleated
3. C
   Both Spindle - shaped, uninucleated and Elongated, without striations
4. D
   Elongated, without striations

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1. A
   D (protoplasm shrunk and pulled away from the cell wall — plasmolysed)
2. B
   B (turgid cell, protoplasm filling the cell wall)
3. C
   C (protoplasm detached only at one corner)
4. D
   A (cell with a star-shaped spiky outline)

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1. A
   Plasma
2. B
   WBCs
3. C
   Platelets
4. D
   RBCs

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1. A
   nerve cell
2. B
   striated muscle
3. C
   parenchyma
4. D
   unstriated muscle

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1. A
   Axon, Cytoplasm, Dendrite, Nucleus
2. B
   Cilia, Nucleus, Dendrite, Cyton
3. C
   Axon, Nissl's granule, Dendrite, Cytoplasm
4. D
   Dendron, Cyton, Nucleus, Axon

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1. A
   X
2. B
   Z
3. C
   Both Y and Z
4. D
   Y

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1. A
   Kidneys
2. B
   Heart
3. C
   Limbs
4. D
   Blood vessels

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1. A
   Collenchyma
2. B
   Phloem
3. C
   Parenchyma
4. D
   Sclerenchyma

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1. A
   Striated Muscles
2. B
   Tendons
3. C
   Cardiac muscles
4. D
   Non - striated muscles

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1. A
   A (Cell wall, Vacuole, Cytoplasm, Nucleus all correctly placed)
2. B
   D (correct labels but arrows on wrong structures)
3. C
   B (cytoplasm and vacuole interchanged)
4. D
   C (nucleus, vacuole and cytoplasm wrongly ordered)

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1. A
   Adipose tissues
2. B
   Ligaments
3. C
   Cartilage
4. D
   Areolar tissues

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1. A
   A : Sclerenchyma, B : Parenchyma, C : Cheek cells, D : Onion Peel
2. B
   A : Sclerenchyma, B : Parenchyma, C : Onion peel, D : Cheek cells
3. C
   A : Parenchyma, B : Sclerenchyma, C : Cheek cells, D : Onion peel
4. D
   A : Parenchyma, B : Sclerenchyma, C : Onion peel, D : Cheek cells

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1. A
   Rabbit and Cat
2. B
   Mice and Rabbit
3. C
   Mice and Bear
4. D
   Rabbit and Fox

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1. A
   T₃
2. B
   T₂
3. C
   T₁
4. D
   T₄

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1. A
   An upright pyramid — widest at the base (aquatic plants), narrowing to the top (large fish)
2. B
   An inverted pyramid — widest at the top, narrowing to the base
3. C
   An irregular three-tier figure with a wide base, wide middle and small top
4. D
   An irregular figure with a wide base, a wider middle than top and a stub below

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1. A
   Marble statues at place X can be seen getting yellowing.
2. B
   At place Y, renewable energy sources are fastly replacing use of conventional energy sources.
3. C
   Plants at place Y can be seen to have burnt yellow looking leaves.
4. D
   At place X there is higher consumption of fossil fuels.

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1. A
   Biomagnification
2. B
   Lindeman's law
3. C
   Both Unidirectional energy flow and Lindeman's law
4. D
   Unidirectional energy flow only

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1. A
   Biomass in a forest
2. B
   Energy in a Grassland
3. C
   Number in a pond
4. D
   Biomass in a pond ecosystem

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1. A
   (ii), (iii) and (iv) only
2. B
   (ii) only
3. C
   (i) and (iii) only
4. D
   (iv) only

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1. A
   P → Q → R → S
2. B
   R → P → Q → S
3. C
   P → S → Q → R
4. D
   R → P → S → Q

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1. A
   S is used in aerosol cans, jet fuel, air conditioners and refrigerators.
2. B
   Q is also produced by incomplete decomposition mostly by anaerobic methanogens.
3. C
   R are synthetic gaseous compounds of carbon and halogen.
4. D
   Excessive use of fossil fuel is adding more P to atmosphere.

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1. A
   Greater reduction in the number of caterpillars than in the number of flies
2. B
   Reduction in the number of hawks and snakes
3. C
   Increase in the number of frogs
4. D
   Increase in the number of sparrows

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1. A
   chloroplast, nucleus, vacuole, guard cell
2. B
   nucleus, chloroplast, vacuole, guard cell
3. C
   nucleus, chloroplast, guard cell, vacuole
4. D
   vacuole, guard cell, nucleus, chloroplast

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1. A
   (i), (ii) and (iv)
2. B
   (iii) and (iv)
3. C
   (i) and (ii)
4. D
   (i) and (iv)

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1. A
   The arrangement in which both neurons have dendrites on the right and arrows point to the left
2. B
   The arrangement in which impulses pass dendrite to cell body to axon to axon terminal, and on to the dendrite of the next neuron, with arrows pointing to the right
3. C
   The arrangement laid out dendrite-to-axon left-to-right but with the arrows pointing to the left
4. D
   The arrangement in which the second neuron is reversed so the two axon terminals face each other

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